Key to Species of the Homalomena Hanneae Complex


Based on Wong, Hoe, Soon & Boyce ( Aroideana V36, 2012 )

Click on 📌 to highlight and compare characteristics.
Click on the line numbers to select characteristics.



1A. PetiolePetiole: Leaf stem. s green or reddish, with inconspicuous paler longitudinal striae .. 2
2A. PistilPistil: The female reproductive part of a flower. late flower zone abruptly wider than staminate flower zone; pistilPistil: The female reproductive part of a flower. s pale orange. Batang Ai (Sarawak) and N part of Ulu Sungai Kapuas (Kalimantan Timur), sandstones .. 📌Homalomena hanneae
2B. PistilPistil: The female reproductive part of a flower. late flower zone imperceptibly merging with, or slightly narrower than, staminate flower zone; pistilPistil: The female reproductive part of a flower. s not pale orange .. 3
3A. PistilPistil: The female reproductive part of a flower. late flowers green. Batang Ai (Sarawak), sandstones .. 📌Homalomena sengkenyang
3B. PistilPistil: The female reproductive part of a flower. late flowers white or yellowish .. 4
4A. Inner side of the posteriorPosterior: lobes (i.e., facing across the sinusSinus: ) rounded, the edges almost touching in robust specimens; leaf blade glossy dark reddish green adaxially, dark purplered abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly; stipeStipe: A stalk or stem. of spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe. strongly dorso-ventrally flattened, c. 8.5 mm long 3 4.5 mm diam. Mulu (NE Sarawak), alluvial forest .. 📌Homalomena ardua
4B. Inner side of the posteriorPosterior: lobes (i.e., facing across the sinusSinus: ) straight, their edges divergent; leaf blade glossy medium green adaxially, somewhat paler abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly; stipeStipe: A stalk or stem. of spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe. cylindrical .. 5
5A. Leaf blade not or only very weakly quilted between the primary lateral veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins. s; petiolePetiole: Leaf stem. and pedunclePeduncle: Flower stem. dull purple red (at least the basalBasal: Forming or belonging to a bottom layer or base. part but more usually the whole organ, with conspicuous paler longitudinal ridges, spatheSpathe: A large sheathing bract enclosing the flower cluster. limb with red margin. Bintulu (N Sarawk), alluvium in seasonally flooded forest .. 📌Homalomena josefii
5B. Leaf blade conspicuously quilted between the primary lateral veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins. s .. 6
6A. PedunclePeduncle: Flower stem. minutely puberulentPuberulent: Covered in soft, downy hairs. (appearing velvety); leaf blade glaucousGlaucous: Covered with a whitish powder or waxy coating. abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly. Santubong (NW Sarawak), Paleogene hard sandstones .. 📌Homalomena velutipedunculata
6B. PedunclePeduncle: Flower stem. glabrousGlabrous: Smooth. Free from hair or down. , glossy or somewhat matte; leaf blade not glaucousGlaucous: Covered with a whitish powder or waxy coating. abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly .. 7
7A. Staminate zone not producing resin droplets, resin remaining in the fissures between individual flowers; lower part of persistentPersistent: Remaining attached to the plant beyond the usual time of falling. spatheSpathe: A large sheathing bract enclosing the flower cluster. during fruiting ventrally much expanded, with dorsal side almost flat; unpollinated pistilPistil: The female reproductive part of a flower. s remaining yellowish white at early stage of staminate anthesisAnthesis: The period during which pollen is presented and/or the stigma is receptive. . Siburan (SW Sarawak), limestones .. 📌Homalomena gastrofructa
7B. Staminate zone producing droplets of resin; lower part of persistentPersistent: Remaining attached to the plant beyond the usual time of falling. spatheSpathe: A large sheathing bract enclosing the flower cluster. during fruiting expanding more-or-less equally ventrally and dorsally, eventually fusiform; unpollinated pistilPistil: The female reproductive part of a flower. s turning dark orange at early stage of staminate anthesisAnthesis: The period during which pollen is presented and/or the stigma is receptive. . Matang (W Sarawak), Paleogene soft sandstones .. 📌Homalomena debilicrista
1B. PetiolePetiole: Leaf stem. proximally green and distally white with very conspicuous prominently raised glossy cherry-red ridges; leaf blade abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly glaucousGlaucous: Covered with a whitish powder or waxy coating. . Mulu (NE Sarawak), shales .. 📌Homalomena striatieopetiolata
 


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